/** @file
  Library class layered on top of PciCapLib that allows clients to plug a
  PciSegmentLib backend into PciCapLib, for config space access.

  Copyright (C) 2018, Red Hat, Inc.

  This program and the accompanying materials are licensed and made available
  under the terms and conditions of the BSD License which accompanies this
  distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
  WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/

#ifndef __PCI_CAP_PCI_SEGMENT_LIB_H__
#define __PCI_CAP_PCI_SEGMENT_LIB_H__

#include <Library/PciCapLib.h>


/**
  Create a PCI_CAP_DEV object from the PCI Segment:Bus:Device.Function
  quadruplet. The config space accessors are based upon PciSegmentLib.

  @param[in] MaxDomain   If MaxDomain is PciCapExtended, then
                         PciDevice->ReadConfig() and PciDevice->WriteConfig()
                         will delegate extended config space accesses too to
                         PciSegmentReadBuffer() and PciSegmentWriteBuffer(),
                         respectively. Otherwise, PciDevice->ReadConfig() and
                         PciDevice->WriteConfig() will reject accesses to
                         extended config space with RETURN_UNSUPPORTED, without
                         calling PciSegmentReadBuffer() or
                         PciSegmentWriteBuffer(). By setting MaxDomain to
                         PciCapNormal, the platform can prevent undefined
                         PciSegmentLib behavior when the PCI root bridge under
                         the PCI device at Segment:Bus:Device.Function doesn't
                         support extended config space.

  @param[in] Segment     16-bit wide segment number.

  @param[in] Bus         8-bit wide bus number.

  @param[in] Device      5-bit wide device number.

  @param[in] Function    3-bit wide function number.

  @param[out] PciDevice  The PCI_CAP_DEV object constructed as described above.
                         PciDevice can be passed to the PciCapLib APIs.

  @retval RETURN_SUCCESS            PciDevice has been constructed and output.

  @retval RETURN_INVALID_PARAMETER  Device or Function does not fit in the
                                    permitted number of bits.

  @retval RETURN_OUT_OF_RESOURCES   Memory allocation failed.
**/
RETURN_STATUS
EFIAPI
PciCapPciSegmentDeviceInit (
  IN  PCI_CAP_DOMAIN MaxDomain,
  IN  UINT16         Segment,
  IN  UINT8          Bus,
  IN  UINT8          Device,
  IN  UINT8          Function,
  OUT PCI_CAP_DEV    **PciDevice
  );


/**
  Free the resources used by PciDevice.

  @param[in] PciDevice  The PCI_CAP_DEV object to free, originally produced by
                        PciCapPciSegmentDeviceInit().
**/
VOID
EFIAPI
PciCapPciSegmentDeviceUninit (
  IN PCI_CAP_DEV *PciDevice
  );

#endif // __PCI_CAP_PCI_SEGMENT_LIB_H__
